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Periodic table (Ionizatiin energy (EXCEPTION TO IE GENERAL TREND (2nd IE…
Periodic table
Ionizatiin energy
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2ND IE
To remove second electron
-Effective nuclear change increase.
-strength of electrostatic, attractiob forces increase,
-energy required to overcome forces increase
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TREND
IE across period
effective nuclear Charger increase
atomic radius decrease
valence electron nearer to nucleus
IE down the group
Effective nuclear charge consant
atomic radius increase
valens electron far from nucleus
Electronegativity
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ACROSS PERIOD
Lower distance valence electron and nucleus,
stronger pulls of nucleus on electron
HIGHER ENERGY,GREATER FOR ATTRACTION FOR BONDING ELECTRON
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Metallic property
NON METAL
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Solid surface is dull,non reflective
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PROPERTIES OF NON METAL
Compound composed entirely of
non metal are molecular substance
(gases,liquid or low melting solid
Non metal oxides are acidic oxides,
dissolve in water to form acids.
non metal oxide+ water -> acid
METAL
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Solid are shiny,lustrous and reflect light
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Electron affinity
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Group1 and 2 has fulfilled s-orbital,
which lends extra stability
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Group 4 5 6 has half filled p - orbitals,
which lends extra stability(lower affinity)
Polarity of molecules
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Cl want electron more than H. as Cl pulls electron away from the H,
a charge builds up on the cl. Instead of sharing electron eqully.
The molecules begins to look ,like an ionic compund. The
molecule has dipole moment and is said to be polar
Molecular polarity effect solubility of water
,polar molecule save attrascted to other polar molecules.
Water is a polar compound
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